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There is another solution to this. I had the unfortunate experience of destroying a megahertz x-jack modem in my 750, due to using it with my company's Toshiba phone system. I found a product by TT Systems called the Modem Mate model MPA-100. This connects in the handset line, and there, the signal is the same whether or not the phone system is analog or "digital". It did take a bit of fiddling to get the levels right. best regards...